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If you have poly pipe in the ground then maybe tree roots have pinched the line.
If it's pvc you might have a break somewhere. Look for pooling water somewhere between the last sprinkler that works and the first that doesn't. Could be anywhere really.
Maybe the valve isn't coming on all the way. Open the bleeder screw on the valve and see if that helps.

Half of zone getting less pressure

I'm having a problem with one zone that is only half working. The first 2/3rds of the heads on the line work fine, but the last 1/3rd of the heads do not get enough pressure to pop up. There is some water to them and I have tried pulling heads up but they don't stay up. Is it possible the line has gotten blocked? Any other ideas for me to investigate.